Quantum critical scaling and the origin of non-fermi-liquid behavior in Sc1-xUxPd3

Phys Rev Lett. 2005 Feb 11;94(5):056402. doi: 10.1103/PhysRevLett.94.056402. Epub 2005 Feb 9.

Abstract

We used inelastic neutron scattering to study magnetic excitations of Sc1-xUxPd3 for U concentrations (x=0.25, 0.35) near the spin glass quantum critical point (QCP). The excitations are spatially incoherent, broad in energy (E=variant Planck's over 2piomega), and follow omega/T scaling at all wave vectors investigated. Since similar omega/T scaling has been observed for UCu5-xPdx and CeCu6-xAux near the antiferromagnetic QCP, we argue that the observed non-Fermi-liquid behavior in these f-electron materials arises from the critical phenomena near a T=0 K phase transition, irrespective of the nature of the transition.